At the bottom threshold of the rear split doors, there are holes through which protrude the bars that the doors latch on. I had some water spill into those holes, and I can't seem to drain the cavity. I can see what I think is a removable bung like that in the footwells of the main cabin, but I can't access it. Does anyone know how to pop that bung so I can clean out the passage? Thanks in advance.